The Welsh carthen is a reversible double-weave blanket tradition spanning three centuries of rural and industrial production across Pembrokeshire and Carmarthenshire. Each blanket carries its pattern in structural inversion — cochineal red against ink black on one face, the exact negative on the other — a visual trick born from the mechanics of the double-weave loom.

This design system channels that structural duality into interface language: bold banded compositions, wool-saturated color, and the tactile grain of woven thread rendered on screen.